N. Vietnam, Prov. Thai Nguyen, distr. Dai Tu, vicinities of Tam Dao town, NE macroslope of Tam Dao ridge at 950-1000 m alt.
(N 21ш27' E 105ш38'). Closed wet evergreen broad-leaved primary forest on very steep mt slope. Tree 7-9 m hg. Flowers white or slightly yellowish-green. Not common.
No VH 5026 31.05.1997
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 5803-96)